David harrington



'glitten tatrs ste-nt @Hirn DAVID HARRINGTON, or WoRCnSTEnASSLGNoR To fnIMSnLr` A'Nn SyA. WOODS, or BOSTON, MASSACHUSETTS. j

LettersPatent .ZVo 79,752, dated July v7, 1.868.

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To ALL wHoM 1r MAY coNoERN: I l y -Be it known that I, DAVID HARRINGTON, of Worcester, in the county et' Worcester, and State of Massachusetts, have iuirented an linproved- Self-Oiling Loose Pulley; and I do hereby declaro that 4the t'ollowing,- taken in connection with Athc drawings .which accompany and form partof this specification, i's a description of my invention suiiicient to enable those skilled in the art to practise it. p p y My invention relates to the construction of a loose pulley, with reference to p rovA ion for keeping the bear? -ing of such pulley lubricated, by combining with the hub an oil-eoritaining reservoir, andpnieans for keeping the oil supplied to the bearing-surface of the hub from such reservoir, and for reconveying the surplus oil from such surface back to the reservoir.

My invention consists-in coring out around the bearing-surface of the' hub an annular chamber,- opening into the bore, in the-form of a narrow, continuous mouth, and extending back from the bore.` enlarging as itretreats, thereby making an oil-chamber of considerable capacity, to the backor enlarged part of which the oil is thrown by centrifugal force as the pulley is rotated, while, when the pnl-ley stops, the oil settles down to the lowest part offthe chamber, and overflowing such part, penetrates between the shaft andbearing-surfaee ofthe p Iprefer, however, to use, in connection with this annular chamber, lateral oil-ducts'leading onttherefrom, l nearly to the opposite ends of the hub,vthese ducts being either `straight, (or parallel witlrthe axis,) or diagonal,

, nndeach duct opening upon the shaft, and widening haek- .therefronu and being Iargestwhere it opens into the main oil-chamber. i

The drawing represents a pulley embodying my improvements. A shows'a central cross-section of the'pulley. B, a section on the'line :c x.

a denotes the hub, `east whole, or with the bearing-surface integral therewith. nfthe bearng-surface of the hubpret`erably nca-r the centre thereof, I core out the chamber c, extending entirely around theV hub, this charnber being narrow at its mout-h, or where it opens on the'benring-surface Z, and extending quite deeply into the hub, widening us it` extends back, as seen at A, it being thus :nude capable of receiring and holdingu a considerable quantity of oil, which is thrown to the back surface of the chamber by centrifugal force as the pulley rotates, whileywhen the pulley is at rest, the'oil settles down itrto' the lowermost part ofthe channel, vand running over the opening of the sameV against the shaft, penetrates between the shaft and the bearing-surface on earch side-oi` the ehanneh'andthus causes the whole sha-ft to be kept lubricated, as will be readily understood. y

Out of each sigle ofthe channel one or more grooves-or oil-ducts extend, such-grooves being either straight, (or parallel with the bearing as seen. at cZ, or inclined, as seenat c. 'v

Each of these ducts is lnadc shallow, and narrow :xt its' outer end, and increases in depth and widtli'from tibrous inaterinl, which by capillary attraction lis saturated, and therebv keeps the shaft lubricated the whole length ofthe hub. v

As the shaft revolves at speed, any excess of oil is thrown-by centrifugal action, to the parte Ofthelducts de that ar'c farthest from the Aaxis of the hub, or, in other wo1'ds,is thrown towards and into the main chamber, from which it is redistributed by the wool or saturated fibre in the ducts, and by the overflow of the oil each way from 'the `chamber c when the pulley'stops. f

By this means the whole bearingsurfaccs of the pulley and shaft nre kept well lubricated, but not excessively so, or without waste ot oil, and with a minimum quantity thereof, the circulation of the oil being kept up by the rotation of the shaft, and being kept within bounds by centrifugal force.

The rnain oil-chamber c may run diagonally around the hub, but I generally prefer to run it straight, or nearly straight, or parallel with. the enflsof'the hub. i Y

The chamber c'is supplied with oil through a. suitable inlet,-f, closed by a stopper, g.

Eac'h lateral duet, or any one or more of them, may-connect at its outer end with a. groove, h, extending moundI the beering-suface near 'the end 6i' tbe hub, this groen-o interceptng any oil which mayinelne to flow endwise beyond the ducts, such oil being by means of such groove and ducts reconveyed to the. main oil# vlchamber, and kept from owing beyond the bearing. y

I claim, in ombinati'onl with the hub of a. loose pulley, nu ennulznj chamber, extending continuously round the hub, and opening-all a'rohnd into the bearing-surface thereof, thisbbam'ber being cored out in -castn g,and being narrow at the bearing-surface, and enlarging backvtherefrom, substantially as shown and deseribed.

I also eliui, in `combination with the oil-chamber c, the lateral duets, made shallow at their outer ends, and y vdeepening and widening towalsandinto the main chamber c, substantially as descrbed.

I'als'o claim, in combination with the nlain annular chamber e and the lateral duet or ducts, an end groove, h, connecting with-the lateral duet or duets, substantially as shown and-described. DAVID HARRINGTON. Witnesses:

E. B. Savon-Imm, M.- B, Goonnnn. 

